Larry Guthrie is a small‑town dreamer who considers himself something of a hero after being given the title “Metro County Miracle.” He has a girlfriend named Brooke, but their relationship is strained by Larry’s sometimes thoughtless behavior. One day, while with Brooke at a raffle for a Camaro, Larry enters even though Brooke doesn’t want him to. He wins the opportunity to get the car by successfully knocking down bowling pins—but only after slipping on nacho cheese sauce in a comedic mishap.
Later, Larry learns that Brooke is now engaged to Beauregard “Bo” Billings, a suave, ambitious man running for mayor of the town. Larry, unhappy with losing Brooke, decides the way to win her back is to help out at her after‑school program. He volunteers, hoping to prove he’s changed and deserves her attention.
On one of his first days working with the kids, Larry makes a careless remark: he tells a boy named Gabe that the Tooth Fairy isn’t real. This upsets Gabe deeply and shakes the belief of some of the children. That night, the fairy Nyx appears to Larry, dressed in a full pink fairy outfit, and informs him that he must serve as a substitute Tooth Fairy. He is given a mission: collect ten teeth in ten days, and restore children’s faith in the Tooth Fairy. If he fails, he’ll lose his greatest memory forever.
Larry wakes up thinking the fairy business was just a dream—but soon realizes it isn’t. Night after night he transforms and tries to fulfill his fairy duties, with varying levels of success. Meanwhile at the after‑school program, Larry’s efforts begin to pay off: he helps to raise money for supplies and shows Brooke that he is serious about growing up. A small act of care—remembering Brooke’s allergies and favorite wedding cake frostings—earns him points over Bo, who is less attentive.
Complications arise when Bo steals supplies Larry had bought for the program in order to make Larry look bad. Disheartened, Larry temporarily gives up his task as Tooth Fairy, believing he’ll lose his cherished memory. But he learns that his greatest memory isn’t the award he won or the recognition, but a special moment shared with Brooke. Motivated, Larry reclaims his Tooth Fairy duties, re‑collects the remaining teeth, helps restore the children’s belief, and makes his relationship with Brooke his priority.
In the end Larry wins Brooke back: she ends her engagement with Bo when she realizes his “greatest memory” doesn’t involve her, and she recognizes her true feelings for Larry. They marry, live together, and expect their first child. As the film closes, Nyx asks Larry to substitute again because the regional Tooth Fairy is ill, and Larry accepts. The story ends on a hopeful note: Larry has grown, he’s regained what he almost lost, and he embraces a role of caring and responsibility.
